Peret Posted April 16, 2012 Share Posted April 16, 2012 I took my rocket test rig out for a run today. I fired three 1-pound cored and nozzled rockets, all made with the same 60:30:10 fuel on the same day with the same tooling (UT). The results are graphed below and are food for thought. Y axis is pounds, and X axis is 1/100ths of a second. In the first image, the blue trace is a motor where the nozzle failed. It didn't blow out, but a piece chipped off resulting in the flame coming out at a slight angle. The yellow trace shows a motor where everything went right. The orange trace... ah yes. The difference with the orange trace is that it was fused with a piece of visco, hooked just above the nozzle. The other two were fused with a piece of bare black match running the whole length of the core. The second image shows the traces for a 2 ounce (3/8") cored BP rocket made on the Skylighter Turbo Pyro tooling, and a Chinese commercial rocket. This latter was about 3 inches long and 3/4 in diameter and was made of some kind of cloudy plastic. You can clearly see the fire inside during the burn, but it didn't melt. I presume from the force curve it was an end burner. Link to comment Share on other sites More sharing options...
oldguy Posted April 16, 2012 Share Posted April 16, 2012 (edited) I envy your expertise in electronics. Edited April 16, 2012 by oldguy Link to comment Share on other sites More sharing options...
dagabu Posted April 16, 2012 Share Posted April 16, 2012 I took my rocket test rig out for a run today. I fired three 1-pound cored and nozzled rockets, all made with the same 60:30:10 fuel on the same day with the same tooling (UT). The results are graphed below and are food for thought. Y axis is pounds, and X axis is 1/100ths of a second. Drooling! -dag Link to comment Share on other sites More sharing options...
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